(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The number of lines per metre in a grating is 500,000, calculate grate spacing.

The wavelength of light going through the grating is 600nm, what is the angle of the first order?

What is the frequency of the light is it's speed is 3 x 10^8 m/s?

2. Relevant equations

3. The attempt at a solution

For 1 I did 1/500,000 giving 2 x 10^6 m/s

2)Using dsin=nλ

I rearranged to give sin = 600/2 x 10^6 which gave me 0.861

Should I have converted the 600 into metres and used 6x10^-7?

3) Using c=fλ

3x10^8 = f x 600

f = 500,000 Again should I have converted the 600nm into meters?

Thanks for looking

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# Homework Help: Diffraction Grating

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